/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_14/src/PhysicsTools/HepMCCandAlgos/plugins/ParticleListDrawer.cc

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#include <memory>
#include <string>
#include <iostream>
#include <sstream>

#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/EDAnalyzer.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "SimGeneral/HepPDTRecord/interface/ParticleDataTable.h"
#include "DataFormats/Candidate/interface/Candidate.h"
#include "DataFormats/Candidate/interface/CandidateFwd.h"
#include "DataFormats/Common/interface/Ref.h"

using namespace std;
using namespace reco;
using namespace edm;

class ParticleListDrawer : public edm::EDAnalyzer {
  public:
    explicit ParticleListDrawer(const edm::ParameterSet & );
    ~ParticleListDrawer() {};
    void analyze(const edm::Event& iEvent, const edm::EventSetup& iSetup);

  private:
    std::string getParticleName( int id ) const;

    edm::InputTag src_;
    edm::ESHandle<ParticleDataTable> pdt_;
    int maxEventsToPrint_; // Must be signed, because -1 is used for no limit
    unsigned int nEventAnalyzed_;
    bool printOnlyHardInteraction_;
    bool printVertex_;
    bool useMessageLogger_;
};

ParticleListDrawer::ParticleListDrawer(const edm::ParameterSet & pset) :
  src_(pset.getParameter<InputTag>("src")),
  maxEventsToPrint_ (pset.getUntrackedParameter<int>("maxEventsToPrint",1)),
  nEventAnalyzed_(0),
  printOnlyHardInteraction_(pset.getUntrackedParameter<bool>("printOnlyHardInteraction", false)),
  printVertex_(pset.getUntrackedParameter<bool>("printVertex", false)),
  useMessageLogger_(pset.getUntrackedParameter<bool>("useMessageLogger", false)) {
}

std::string ParticleListDrawer::getParticleName(int id) const
{
  const ParticleData * pd = pdt_->particle( id );
  if (!pd) {
    std::ostringstream ss;
    ss << "P" << id;
    return ss.str();
  } else
    return pd->name();
}

void ParticleListDrawer::analyze(const edm::Event& iEvent, const edm::EventSetup& iSetup) {  
  Handle<reco::CandidateView> particles;
  iEvent.getByLabel (src_, particles );
  iSetup.getData( pdt_ );

  if(maxEventsToPrint_ < 0 || nEventAnalyzed_ < static_cast<unsigned int>(maxEventsToPrint_)) {
    ostringstream out;
    char buf[256];

    out << endl
        << "[ParticleListDrawer] analysing particle collection " << src_.label() << endl;

    snprintf(buf, 256, " idx  |    ID -       Name |Stat|  Mo1  Mo2  Da1  Da2 |nMo nDa|    pt       eta     phi   |     px         py         pz        m     |"); 
    out << buf;
    if (printVertex_) {
      snprintf(buf, 256, "        vx       vy        vz     |");
      out << buf;
    }
    out << endl; 

    int idx  = -1;
    int iMo1 = -1;
    int iMo2 = -1;
    int iDa1 = -1;
    int iDa2 = -1;
    vector<const reco::Candidate *> cands;
    vector<const Candidate *>::const_iterator found = cands.begin();
    for(CandidateView::const_iterator p = particles->begin();
        p != particles->end(); ++ p) {
      cands.push_back(&*p);
    }

    for(CandidateView::const_iterator p  = particles->begin();
        p != particles->end(); 
        p ++) {
      if (printOnlyHardInteraction_ && p->status() != 3) continue;

      // Particle Name
      int id = p->pdgId();
      string particleName = getParticleName(id);
      
      // Particle Index
      idx =  p - particles->begin();

      // Particles Mothers and Daighters
      iMo1 = -1;
      iMo2 = -1;
      iDa1 = -1;
      iDa2 = -1;
      int nMo = p->numberOfMothers();
      int nDa = p->numberOfDaughters();

      found = find(cands.begin(), cands.end(), p->mother(0));
      if(found != cands.end()) iMo1 = found - cands.begin() ;

      found = find(cands.begin(), cands.end(), p->mother(nMo-1));
      if(found != cands.end()) iMo2 = found - cands.begin() ;
     
      found = find(cands.begin(), cands.end(), p->daughter(0));
      if(found != cands.end()) iDa1 = found - cands.begin() ;

      found = find(cands.begin(), cands.end(), p->daughter(nDa-1));
      if(found != cands.end()) iDa2 = found - cands.begin() ;

      char buf[256];
      snprintf(buf, 256,
             " %4d | %5d - %10s | %2d | %4d %4d %4d %4d | %2d %2d | %7.3f %10.3f %6.3f | %10.3f %10.3f %10.3f %8.3f |",
             idx,
             p->pdgId(),
             particleName.c_str(),
             p->status(),
             iMo1,iMo2,iDa1,iDa2,nMo,nDa,
             p->pt(),
             p->eta(),
             p->phi(),
             p->px(),
             p->py(),
             p->pz(),
             p->mass()
            );
      out << buf;

      if (printVertex_) {
        snprintf(buf, 256, " %10.3f %10.3f %10.3f |",
                 p->vertex().x(),
                 p->vertex().y(),
                 p->vertex().z());
        out << buf;
      }

      out << endl;
    }
    nEventAnalyzed_++;

    if (useMessageLogger_)
      LogVerbatim("ParticleListDrawer") << out.str();
    else
      cout << out.str();
  }
}

DEFINE_FWK_MODULE(ParticleListDrawer);